> But Christianity does not have an equivalent of Sharia
Christianity absolutely has, in each of it's iterations, bodies of behavioral norms which believers seek to have instituted by the State, or institute by themselves (sometimes through violence) independent of the State.
> (Pakistan has Sharia courts)
The UK, for example, doesn't need the Christian equivalent (ecclesiastical courts, which, also, the established Church has) for blasphemy, because blasphemy against Chritianity has, for over 400 years, been cognizable as an offense against the common law, so the regular courts deal with that. [0]
> nor does it have much to say about statecraft in general.
Christianity has quite a lot to say about statecraft. Thanks to the success of European colonialism, much of what powerful branches of Christianity has said about it have been influential in shaping international law, both customary and treaty.
[0] https://en.m.wikipedia.org/wiki/Blasphemy_law_in_the_United_...